diff --git a/websocket-sharp/WebSocket.cs b/websocket-sharp/WebSocket.cs
index fe376cb6..a3af817f 100644
--- a/websocket-sharp/WebSocket.cs
+++ b/websocket-sharp/WebSocket.cs
@@ -955,7 +955,7 @@ namespace WebSocketSharp
         return false;
       }
 
-      if (!validateSecWebSocketVersionClientHeader (version)) {
+      if (version != _version) {
         message = "It includes an invalid Sec-WebSocket-Version header.";
         return false;
       }